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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36202d019d33ccc88404a5d2e36833bf9e22003648c3e611cbb51e4bc67c6fc2' 
  AND token = 'vZMIWucCI/98jBeV6ZpSDfO2DvR7N9kl5Hy1IY4cOkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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