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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36f4af75ee4078e9dc33062c484300e8a7e23d7ff54e4534e4ee5f7b41aa4eb' 
  AND token = 'Ta3fRK1PIOCVz5vFfiY9msrw/ITwwA0xYZv72yGao8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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