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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c313df9a002541ab515f890c934e59524027444a95decbde3b39b4c24c1ee9' 
  AND token = 'Bv0FBFsPKRDAi6WpI70ouptsKOCd+mNe9kmlMc1kamg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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