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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7178511de2a99b657673d5d9bcbef07ef6d6f6fce4c03a4617ea2414198b011d' 
  AND token = 'ia+0kzssWVs5AOvfMMSCV4JmN7vX6ItcWzw0q31CB9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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