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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847b0ad05c89760e1bcac9f23c6d6dab1d5cd65041f824f27ee89472b1cd3c88' 
  AND token = 'HRAGSyLIP048FRhemwSMF2+3ZiWE3SEBNvqhSXsRQdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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