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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416433a4be791949279782fe402ab507ab9a51513d374ce4b6b0591553adfde7' 
  AND token = '2zI59Qug64Linm2BuHVIbYF0u143rYpg9yeP3m5IW0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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