SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c90f9739b11bad0612b32f5a7c7b041ce32c72878a411f22241ec31df427e5' 
  AND token = 'CQpFPJ0JdlvRRFB/q94GuPhupAdIadsXTI4L/L86/UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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