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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6dce81adb311231bd99d0540bee45a374b1c2fc24568a42deb866163f7c7f3' 
  AND token = 'L2JKMrCVeDQcuz2EyylWQNYNsC+RpFizIQNt1sFQ9RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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