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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fdcd349e205496a4b787ba5d8676aaf8f20a667855a6c717d3ffb8bdff00cc' 
  AND token = 'tPx7YAL7dgjuXDyra7tBxqZjgCuN9H3BJ5bccS6mrHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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