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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815782416237f1c042e5ed99dda509a91e01f5bc1de5f89cb0fd5ce1f954a99f' 
  AND token = 'iCYPMhjB7hWnx91XfuDs+6PrDq7fz9cOou89rRrp0jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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