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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86969f61c9703200d54828dbb622ddedc0395fe164a2365698c13e3ef46d5e0f' 
  AND token = '8OPDrz0lwJbkSr3Bg4q5PSOIBweFVgudEqk8Hu8mdtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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