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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13361636d089456e408bdc8ef8f666e53614ce1f2be85cfe80c33efa4b27ba01' 
  AND token = '2qTA61EntuHnVIv8oy6p8OrBw2o3EVfXShx9/C8ZhCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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