SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0555d64730ce81d7d25451f6ba434396dee48a78bb110132f4e870dc6afca1d' 
  AND token = 'ZUyRalBP9/INL+OTntNDaXkYqM26cSaYv/Kg+VzDDj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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