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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9c56ae27cb240d3a6efc8718d70d3bd714bcca4e801133f3b37f4f2a47af98' 
  AND token = 'yAb8NhIZsOunW11vyQLHrTZNCACfQyt5iABH5oN/+JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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