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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377b040ea749be220433ba0ce59b4bbf2acfbbe5cabfb5c1f8be40c8ef8c4609' 
  AND token = '/+9ajjPZnkwdSkkUxzTGRopOuyVN+kImrYvhUX3am0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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