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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b6bb0d98818253f99c1003365c360f04a7e10490c4246b36bb1348b244fdbe' 
  AND token = 'rDw1Zs9Q3XAm64+d+xRV288BCJeC+9H/xWXJ3GxFb74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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