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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8798be19240adb2f2ac88c46ef145b05b61c166f0b207469de178a89defaf0a6' 
  AND token = 'Q14tHuQYrJRkVpN/fYqkYG5QlRGv2yKWh7DSEwp1hoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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