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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a7c0273472c13cbf80a4f8afd5c78cc2f1c26db66f3076534eba06e7229437' 
  AND token = 'Cp8jzhMVKJxq0aE0aeVVW4gQ2qeISgXd+Yx3b5F4quI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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