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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e588ededaafe9602bdba61cd44cdbd54c4ba5d927282c2e759c246b93671f8' 
  AND token = 'X4uIZ1HxXep8Kig8CMms93fgteqO671ImlRGT/Vv7nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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