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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795d96955083b6c064c8c317a4bb63698fb40501db1e432ade731b4a971459d5' 
  AND token = '8fotPufW64+tePwASV/HF/gqSndCI+U0oUqeoKtiQio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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