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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae1c5c9630fd6c60a5d286b17ef5b83c524390c28951b8e8c7a2be16978b05f' 
  AND token = '65Wa1Z9jCJkGsISzyBpAsT4klwieq5a0RT/nB21VHqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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