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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d804ccf3b0fbeb5881731e9aa5551620253c7237a51024a84179124f36e4967' 
  AND token = 'M5f6Dvhooxtoi7asgLlzzXHRff5ZI4CBRsuhe2S0lxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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