SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228430922cb9da010401ff73d4299e0f219cdc11b9de1fa5b648e6f5913f5758' 
  AND token = 'XV1/SoA4bhb4Gp4yrgs/G1YZ5qbG9ZPpBwS4uS7CKYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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