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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87dbaf7e8aa1d5ba555680f0069bb1c1d133ddf5b43eb5d8eaaa23f3185d951' 
  AND token = 'Q96YIMGKAYiWrz4w7GeVoqWaQKtY7HkbHyTbR5RcIPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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