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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce209b5edcdb6c6bd8234adccfb91f78b65ab8a9ee44572400f4c63b66eb6479' 
  AND token = 'NqjRPXFq0NTQvTN+qtKdf7lfd3hulbOPh/6UcHMc6Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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