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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3029f6bb86cae830c450e379957f112e8dd072ea656cf3bcf3ae9ac852f6f0ee' 
  AND token = 'Lk3/cCw6O9vJFjYwORGOh7hH6f0MWxuKtn6aYWd+65E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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