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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3dc83a25f0bde448cf6857b393ed21f9b9ca62cb77d253c9f35d9d6ab7ed17' 
  AND token = 'ic4mvKwGxiiHp7bJ0BbtRX1hXB9iI7TwuPbWCnU5xA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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