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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2529bb3558a14dff0e41401e1f5404862398e7815930c845b15f02d7d7831b' 
  AND token = 'SF5BQa1nKNo4xR8bdl3e3CNHqZnKWa3lqRcvok+DtVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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