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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2e62716b62bbefd06768710ee6b9f3c30bbfecc1e4596fd73f18529fa33d46' 
  AND token = 'szmkeUO6ByAd1nczbnSgJJDLIAsY5K5bQyZY8Stl1xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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