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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7545a27679c8e15887ed3beea5097430d9a24bd1e0520483fe625367d5495133' 
  AND token = 'l9vhxnewCJb8TKz9m08BMDT+gXw1SUpmgVu6Aw2agU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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