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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dbdbd64b69e7630d89ccc960cded9170e363b37fa8cad0f48b4a62c54e8faa' 
  AND token = 'pS8Z6G7GPiu/cMxWJhCQHBOEf8MB5M0sx3hy5ZVZRgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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