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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd71a738ce2b29eb39851f1f6c61449b4948a6049c74551e49c438f10fb4d7c0' 
  AND token = 'iaDdlmcirqHZDyU5o1MVpqqt8PHX3GNt/jPySaq8Fqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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