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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa416238dffb7e5a0ff62f29b69eda6310aa1019de7daf6de5f00c9cd03259c' 
  AND token = 'GHcIjRHFWn15bR4QZxt1wK2MctC/5yJFJAhAelK2uMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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