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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98561ddae3177f5a710ead01034a911716b2c4e960a65793fb1b31605b89845' 
  AND token = 'hdPDPaNsyUxEqf1RXss4KreejXl3orlQzIkzSc+X+kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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