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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33dcad8fb91a66a409de5b5b98a2afbbddddf9f050f4811478219ddca4e1863f' 
  AND token = '8XYrFIVFu6P1oJSC721rvqVp83aQaLNP4MCxmXAkw88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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