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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e798e0215e67e9bbed31215dae0ba5c671589a88aa5a6f83d1895105f813963c' 
  AND token = 'B9pyl3wqQG2IrGDK0HYvpvnLD5g7/V9o8bXmTDdi9Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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