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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe197b01296b73afa22b244957e8f1c079c53b5998ea83315da5889ce0e8a66' 
  AND token = '3vEcgtXfhfNuwlFzjr0/2wcld+T/8J/swTH9tleOqgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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