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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce60318b4571ef0e32e4d2e33aaa0cd09d27d70e621731dbb4972d9c15e4567' 
  AND token = 'mnquVxOA0Jq0s7GNuEkPVoVXrRVGXLu8bmMUz0PFQ5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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