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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff40d20567b155d6705407f7360fd756e079e1ce62408fbe05467888526a05e' 
  AND token = 'vItMzBGbfLARMuq2aFhkC3Dwg5t+U6Su+Lo1Vt6kaE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}