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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9730de50fde3ef9a4ae360f256b87d7f35ab38ed1c940e1cd507b63518b7fec1' 
  AND token = '4GOk/LffiKarfgTK6moHwXSfQRKqgkJ5ZVJvNi6uYp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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