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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e12fae6195ae6df4f4e1749c25e10479155c8a18efd17f126cd357a50418df' 
  AND token = 'YNJnWzYI7Bza9SzXKlJElgzj4uc4Ise/Z+Ko/r9udQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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