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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a551ae0a7c562d9dbf5d394cee6bbea4e39274f153063db7c17a8a7ba8123695' 
  AND token = 'CLQEqyF1lgNdZ/U0w18nUt0mtCuK8ofFafbszqWoCqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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