SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a17e02d85bdc973b6fa0d44ef3909401c23445815a98c4df1ee1c8a0f64ff5' 
  AND token = 'G95CVrVS5kXpjFmUwWi6gNlzOIvGhQzXVqBMQQ2lgdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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