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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8793751483d3d11dfe12e92525280e3d9b3426ab49a90e17d177c8eab7906295' 
  AND token = 'Cc7RNZe2kFNsIHF/qqjXZUlvffrOB3lkrAs3/BLsy9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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