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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e436c3e9b27f92dcefa86e80782f38d4ffdb404be6fcb48d4846bdef854e58' 
  AND token = 'Q8vGzlTHz+HHn4WX44h0VxF0e2jyPuYYhDfDjMQ5FtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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