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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f98adc0016c18f018ea9b38a6ceb039dcd6bd80a58e2f861163ae4c2b6ffd5' 
  AND token = 'KA49kgA8ec/z5N91W1moY040eD8+RIos8eMFbGgIQTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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