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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcff29516e3ddd60b6082e505a6fe42d8e30a94fb5582d96c88a91957501e7a5' 
  AND token = 'tue8mp5DGvO1iMrgGgnOG0HCiRbiQoa/yio2BpUnIao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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