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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce5f3c97b282696f54a17bfd7c42cd51b7e0663cdbb86bbed6a371a69b26ed6' 
  AND token = 'Dy+cs2cvdeGHZ7HfatRlg/DuvaOiByN8rkN8QuM6cmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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