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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcbc4f63762f0b0ee9bc75235e792eb88cc86f624299b624d4767c555d5b8ee' 
  AND token = 'uKv1h7gIVug3RM1gX6xscnXa1RcQm1lGileypXdF3/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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