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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f23beec8d5a5fd1aada3f971a1044741877a27a8e3e85fb53de194dadbb6c1' 
  AND token = '3jdbuPInX/N3jfToxSriuDH5LerfyEDD+y4kAugYvIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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