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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bd6c360efc5c8336c10b21fdcc0f44973bef0a1e4dff8a7f0077a48a213cf6' 
  AND token = 'kE5Uc2bQ0Kt+E6S0uZScD4ez7P/umBQy+HN11ApAnW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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