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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1c686205c700cc821bba2fde6bd79d446ed9109b917ffa85509c73c4eb5f02' 
  AND token = 'yfEL6+zv36Nw7LCnOURVW9hIGULOKwooLGKWbQUo3h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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