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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942540a11d696ba94e801c8decc130a994cb83b70552773719d697f6cb690f07' 
  AND token = 'vY77W5+vc00fhvBrgAEXSmf+Qhin28umI4kP+Z5iFZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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