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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2daa4814defdf776b9022023f890e416dfc3e983dec83b6651a463286fa1109' 
  AND token = 'f9nNG55waw978LgweWDTzaSHs21Bil3kUBvJPMfXoM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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