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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20002cabff6ecf0c9942e5b591bafc5856e4c61418aa9b78d2e015b7ea05318d' 
  AND token = 'dN8xdweV9ygv+lyFXAfMJwKNLTeaW7rDVTN5zBVll/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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