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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e5a37dc3120a3b324b56c8da8627d163e5d3e0ff73a2308b2b90fe6ef992d6' 
  AND token = '2Nb8HAF5m6LovZj9jCy72X27sTfyN0sLyNOdW1qxBtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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