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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec19c72a48108a230d06cec5c0ec8a8a6ef9b4c97e200e7f79d7e3e02f920367' 
  AND token = '+LvFR3YXM1zB1nC98afyewY/nkSrWnCOASg3tt1dJLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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