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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde0d8dddc2fc29f7b5354fd5ca710394d00357842e6df2cbe6e19af4546c992' 
  AND token = '7uIfMOpuMuAQa6OWEfHZ3SzVF4wqcdH3PfU/ROAvi40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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