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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82e71af5c410923e85267e08dc4e792feceec5c7ca3343272321675d58748ce' 
  AND token = '9DIyw+ju2kXpnHRJSkiHYL8batqEXPqw75XwkUIzhlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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